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a•a

Pronunciation: (ä'ä), [key]
—n.
basaltic lava having a rough surface. Also,a'a.Cf. pahoehoe.

AA

1. See administrative assistant.
2. See Alcoholics Anonymous.
3. antiaircraft.
4. See author's alteration.

AA

—Symbol.
1. a proportional shoe width size, narrower than A and wider than AAA.
2. the smallest proportional brassiere cup size.
3. a quality rating for a corporate or municipal bond, lower than AAA and higher than A.
4. Elect.a battery size for 1.5 volt dry cells: diameter, 0.6 in. (1.4 cm); length, 2 in. (5 cm).
5. Brit.a designation for motion pictures certified as unsuitable for children under 14 unless accompanied by an adult. Cf. A (def. 11), U (def. 5), X (def. 9).

aa

—Symbol.
(in prescriptions) ana². Also,āa

A.A.

1. See Alcoholics Anonymous.
2. antiaircraft.
3. antiaircraft artillery.
4. Associate in Accounting.
5. See Associate of Arts.
6. See author's alteration.

A, a

AAA